Instruction manual

Mitel 5540 IP Console - User Guide
72
Glossary
Busy out
A feature allowing you to make a line or equipment indicate busy to an incoming call. In effect,
you take the line out of service until it can be repaired or tested.
Camp-on
A feature allowing the system to queue calls directed to a busy extension, and then automatically
connect the waiting party when the extension becomes free. The busy extension hears a quick
beep to indicate a call is waiting.
Central Office (CO)
A facility housing the public telephone system and related equipment which provides telephone
service for customers in a geographical area.
Class of Restriction (COR)
When the system is programmed, the extensions and trunks are assigned to different Classes
of Restriction. A COR controls the outgoing call capabilities of the extension or trunk. For
example, an extension can be assigned a COR that prevents it from making outside calls other
than with the assistance of the operator.
Class of Service (COS)
When your telephone system is programmed, the extensions are assigned to different Classes
of Service. Each class has access to a specific set of features.
DISA (Direct Inward System Access)
A feature which allows callers to dial directly into the telephone system and use its features
and facilities.
Hardware
The physical components of the system.
Hunt Group
Extensions assigned to a group with a common (pilot) telephone number as well as their own
personal extension numbers. An incoming call to a hunt group will ring the first available
extension.